Establishment and Improvement of Prediction System for CRSS ratio in Polycrystalline Metals

Critical resolved shear stress (CRSS) determines the ease of slip deformation of metals and the values are different among slip systems. The CRSS ratio among slip systems is an important factor governing the plastic deformation mechanism. Thus, estimation methods for easily evaluating the CRSS ratio will play an important role to understand the deformation mechanisms. While our laboratory has developed a prediction system for CRSS ratio, it has not been sufficiently verified. In this study, this prediction system was verified using the results obtained by and input parameters employed in crystal plasticity analysis, and we showed that CRSS ratios were successfully predicted when two or more slip systems were activated. However, the prediction failed when only one slip system was dominantly activated. The method to improve the prediction accuracy was also discussed.